This example demonstrates customizing axes in a bar chart built with D3 v5, loading data from an external CSV file and rendering it as SVG rectangles. It uses `d3.scaleLinear` and `d3.scaleBand` to map numeric and categorical values, while `d3.axisBottom` and `d3.axisLeft` generate the axes with custom tick formatting via `d3.format`. The code removes default domain lines, adds a custom axis label and title, and styles tick marks and text through CSS.